Line Trace not detecting different door's skeletal mesh

if you this does not “fix it” then you it might still be a different collision response:
in your BP_Blast_Door find the Collider in question->Collision->“Collision Preset” and under Collsion Response (?) → “Trace Response”->Visibility make sure this is set to “Block” and see if that fixes it. if there is no specific collider parent component you can check the SkeletalMesh for the same Collision section.

testing collision against Skeletal Meshes is not great especially if there might be many items to test against, and generally for the best Binary Space Partition search having “as simple collision as possible as early as possible” will give the best result.

though if you did the Duplicate option in my above response then the collision setting will be copied anyways.